Sync rpicamsrc and appsrc in RTSP server

[bomba]

Hello,

I've got an RTSP server streaming combined audio and video:

Video comes from raspberry pi camera module element, rpicamsrc.
Audio comes from an usb-serial connected ogg encoder, injected using appsrc.

rpicamsrc -> videocaps -> h2s4parse -> rtph264pay pt=96
appsrc -> oggdemux -> vorbisdec -> audioconvert -> audioresample -> alawenc
-> rtppcmapay pt=97

It works, but the audio/appsrc branch is ~4 seconds late. 

How can I sync this? any suggestions?







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